He may be a super star to the rest of the world, but to his little sister Jazmyn, Justin Bieber is simply known as big brother!

Since moving to Atlanta with his mom Pattie Mallette to pursue his music career, Justin Bieber hasn’t had much time to spend at home in Stratford, Ontario with his dad Jeremy Bieber and his half-siblings Jazmyn and Jaxon.

But yesterday, Feb. 1, Justin got to spend the whole day with his little sister Jazmyn, 2, while he promoted his new 3D film Never Say Never in Toronto. “Happy. Playing with Jazzy,’ he tweeted upon arriving in Canada. “She is saying BIEBER BIEBER BIEBER. LOL.” Aww, what a nice big brother!

Justin took the adorable Jazzy with him to New.Music.Live to promote his film and she even joined Bieber on air for his interviews with eTalk and Much Music, where she kept herself entertained with his iPhone. “My little sister calls me ‘Bieber,'” he told Jay Leno on the Tonight show on Friday, Jan 28. How cute is that? Justin also toldDavid Letterman that it is pretty exciting to see Jazmyn and Jaxon grow into the people they will become — I mean, Bieber did get his start a very young age. “It’s cool to see them grow up, they’re like babies so it’s really cool.”

And although he hasn’t seen his parents together much since their divorce back when he was only3-years-old, Patti and Jeremy both stood by him on the purple carpet of the Toronto premiere of Never Say Never. “My parents weren’t the type to talk trash about each other,” he explained in Seventeen Magazine. “Some parents, when they split up, the mom will say, ‘Your dad’s a jerk,’ but mine were never like that. So that definitely made it easier for me. I knew they loved me, and they split up because of them, not because of me.”